What are the statistics available on diet,complications,foot care of diabetes mellitus?

The short answer is to keep the diabetic control tight enough to have the hemoglobin A1C in the low 5's or under 5%.
If there is already compromise of the arterial circulation of the legs to address that systematically & regionally. If there are already ulcers need aggressive regional care. If there is already bone infection, it's more a matter of chronic management, but not impossible to cure. And get professional toenail care, wash feet & keep well lubricated daily, and never ever go barefoot or in stocking feet. Always wear shoes that are protective. Inspect feet daily for any breaks in the skin; even a small crack can lead to loss of limb. If there is any tinea pedis ('athlete's feet') must treat, as eventually leads to microbes in the skin which give the bacteria a port of entry.
Lastly, Indians genetically have a high penetrance of dyslipidemia (cholesterol problems) & need a treat that very aggressively (in order to prevent hardening of the arteries of the legs); the most aggressive doctors treat it to get the "non-HDL" at about 100, and the "LDL" at about 70. (the non-HDL is the total cholesterol minus the HDL, & is a proxy marker for the agressive sub-fractions of the LDL). There was a study a few years ago in Lancet on Indians & had statistically smaller coronary arteries; can debate the why of that, but to me it means the most aggressive standards of a care needs be applied to any diabetic Indian.
And no smoking, ever!!